![background image](http://html.mh-extra.com/html/gardner-denver/welch-self-cleaning-dry-vacuum-system-dryfast-2025/welch-self-cleaning-dry-vacuum-system-dryfast-2025_owners-manual_563941020.webp)
Problem
Possible Cause
Solution
�
Motor failure
�
Change Motor
seize
d
pump
�
Broken diaphragm – Con-rod connection
�
Change Diaphragm and/or Con-Rod
�
Poor readings
�
See section 2.25.1 Analog Vacuum
Gauge
�
Check vacuum performance - See
Poor Vacuum section above
Analog
ga
uge
�
Gauge not responding
�
Remove housing cover - check
connections and ensure hose is not
kinked. If hose is loose or kinked,
reattach or straighten.
�
If problem persists, verify vacuum
with independent vacuum gauge. If
independent vacuum gauge reading
is still poor, Contact Welch Technical
Service.
�
Poor readings
�
See section 2.25.2 Digital Vacuum
Gauge
�
Check vacuum performance with
independent gauge - See Poor
Vacuum section above
�
No display
�
Check power and power cord
�
Turn pump off and UNPLUG PUMP,
wait 30 seconds, re-connect to power
and turn pump back on.
Digital
gauge
�
Displays "CAL Err"
�
Unit has detected a calibration error.
M
ec
ha
ni
ca
l F
ai
lu
re
s
Po
or
Vacuu
m
�
Leaks
�
Check inlet jar for leaks - Check inner
gasket and fittings, tighten if loose.
Disconnect pump from system, block off
inlet port, check vacuum level on the
gauge.
�
If vacuum level reading is good, work
back through your application checking
for leaks.
�
If vacuum level reading is still poor,
check vacuum control valve and gas
ballast to ensure they are completely
closed.
�
If vacuum level reading is still poor,
disconnect pump from the application and
run the pump for 10 minutes with the
inlet port open, turn unit off and allow the
unit to complete purge cycle (clean).
Repeat and retest vacuum performance.
�
If problem persists, contact Welch
Technical Support*.
19
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com